One team in that chase pack, the Seattle Seahawks (3-1), has a defense that has allowed the league’s second-fewest points, thanks in part to its having intercepted the second-most passes. Advanced statistics suggest its quarterback, Sam Darnold, is among the season's best.

The only reason most fans do not recognize the 49ers as a Super Bowl favorite is that their roster has yet to be complete this season. If they can get George Kittle, Brock Purdy, their entire wide receiver corps and a few others healthy in the next few weeks, they have a chance to make a run at the No. 1 seed.